GRETA Ring Product Specifications Material: 18k Gold and High-Performance Titanium Shape Memory Alloy Stone Options: Diamond | Precious Stones: Ruby, Sapphire or Emerald | White Cubic Zirconia Gold Finishes: Available in YELLOW Gold, WHITE Gold, ROSE Gold, or BLACK Gold Available Sizes: XS | S | M | L | XL (shape-memory technology allows slight adaptation to nearby sizes for a flexible fit) Collection: DIVA Shape Memory Technology Our signature shape memory alloy allows the jewelry to gently flex and adapt. While the initial size may vary slightly depending on how it is formed, the technology enables the piece to gradually mold to your personal size and shape over time, giving you a perfect, comfortable fit. The shape-memory technology also allows the ring to adapt slightly to nearby sizes, ensuring a flexible fit. Size Diameter US Ring Size XS 15.7 mm ~5 S 16.7 mm ~6.5 M 17.7 mm ~7.5 L 19 mm ~9 XL 19.6 mm ~9.5 *Shape-memory technology allows slight adaptation to nearby sizes for a flexible fit.